<template>
  <div>
    <!-- 工作日历, 年和月 -->
    <div class="select-box">
      <el-select v-model="currentYear" size="small" style="width: 120px; margin-right: 10px" @change="changeDate">
        <!-- 年份取给定年份的, 前五年 + 后五年 -->
        <el-option v-for="item in yearList" :key="item" :label="item" :value="item" />
      </el-select>
      <el-select v-model="currentMonth" size="small" style="width: 120px;" @change="changeDate">
        <el-option v-for="item in 12" :key="item" :label="item" :value="item" />
      </el-select>
    </div>
    <!-- 日历 -->
    <el-calendar v-model="currentDate">
      <!-- date 展示的是当天日期 -->
      <template #dateCell="{ date }">
        <!-- {{ date }} -这是date -->
        <!-- 只展示日期里的天 -->
        {{ new Date(date).getDate() }}

        <div class="date-content">
          <span class="text">{{ handleShowWeek(date) }}</span>
          <span v-if="isWeek(date)" class="rest">休</span>
        </div>
      </template>
    </el-calendar>
  </div>
</template>

<script>
export default {
  props: {
    startDate: {
      type: Date,
      default: () => {
        return new Date()
      }
    }
  },
  data() {
    return {
      currentYear: null, // 当前年份
      currentMonth: null, // 当前月份
      currentDate: null // 当前日历上选中的日期
    }
  },

  computed: {
    // 要遍历的年的数组
    yearList() {
      const list = []
      // 当前年的前五年加后五年
      for (let year = this.currentYear - 5; year <= this.currentYear + 5; year++) {
        list.push(year)
      }
      return list
    }
  },

  // 监听器监视选中的日期，从而影响select里面的年份和月份
  watch: {
    currentDate(newVal) {
      // 点击选中的日历，影响select里的年份和月份
      this.currentYear = new Date(newVal).getFullYear()
      this.currentMonth = new Date(newVal).getMonth() + 1
    }
  },

  created() {
    this.getCurrentTime()
  },

  methods: {
    getCurrentTime() {
      this.currentYear = this.startDate.getFullYear() // 得到当前年份
      this.currentMonth = this.startDate.getMonth() + 1 // 当前月份
    },

    // 改变日期：
    changeDate() {
      // console.log(this.currentYear)
      // console.log(this.currentMonth)
      this.currentDate = new Date(this.currentYear, this.currentMonth - 1, 1)
    },

    // 判断是否是周末
    isWeek(date) {
      return date.getDay() === 6 || date.getDay() === 0
    },

    // 处理日历上显示星期几：
    handleShowWeek(date) {
      const weekDay = new Date(date).getDay()
      const weekName = ['周天', '周一', '周二', '周三', '周四', '周五', '周六']
      return weekName[weekDay]
    }
  }
}
</script>

<style lang="scss" scoped>
.select-box {
  display: flex;
  justify-content: flex-end;
}

::v-deep .el-calendar-day {
  height:  auto;
}
::v-deep .el-calendar-table__row td::v-deep .el-calendar-table tr td:first-child, ::v-deep .el-calendar-table__row td.prev{
  border: none;
}
.date-content {
  height: 40px;
  text-align: center;
  line-height: 40px;
  font-size: 14px;
  display: flex;
  justify-content: center;
  align-items: center;
}
.date-content .rest {
  color: #fff;
  border-radius: 50%;
  background: rgb(250, 124, 77);
  width: 20px;
  height: 20px;
  line-height: 20px;
  display: inline-block;
  font-size: 12px;
  margin-left: 10px;
}
.date-content .text{
  width: 20px;
  height: 40px;
  line-height: 20px;
  display: inline-block;

}
::v-deep .el-calendar-table td.is-selected .text{
  background: #409eff;
  color: #fff;
  border-radius: 50%;
}
::v-deep .el-calendar__header {
  display: none
}
</style>
